Hi guys! I have been researching my tail off about low-tech tanks, but I still have a couple un-answered questions. I am hoping you can help.

Is it okay to do a low tech set up with 1 1/4" eco-complete planted aquarium substrate on the bottom layered with 2" white sand on top?

Should I use eco-complete mixed into my top-soil?

I am setting up a couple tanks, and a bit nervous about doing it. I am trying to figure if I should do the mineralized soil technique or the miracle grow potting soil route. What are your opinions?
Thanks guys!